__________________I have been a silent witness
to all of America's finest hours.
But my finest hour comes
when I am torn into strips and used as bandages
for my wounded comrades on the battlefield,
When I fly at half-mast to honor my soldiers,
Or when I lie in the trembling arms
of a grieving mother
at the graveside of her fallen son.

Yeah i'd heard somewhere that 1:9 was ideal for 63gr, but the manual that came with the rifle specifically mentioned 55gr. Guess i'll invest in some different brands/weights and check it out. Gives me an excuse to spend a weekend at the range at least haha.

__________________Assumption is the mother of all ****ups.Know what you know, Know what you don't know. -Paul Pedzolt"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul

First of all Mountainman is correct. I theory the 1:9 will shoot 55 grain to around low 70s OK. The faster the twist the heavier the bullet that will shoot best in it! In the 1:9s they usually most like the mid 60 grain bullets best as far a optimum accuracy. However the theory is not always perfect. Most 1:9s will shoot the 55 grain rounds well. As the guys stated, the 50-53 grain bullets will shoot OK and should be fairly accurate as well.I do not believe it will give max accuracy performance but for the average shooter if not shooting on a bench on the bags one would never know the difference. So yes it will shoot them. For example I have a Rock River Elite CAR A-4 with a 1:9 twist. Shooting Federal P223 E ammunition in 55 grain. It will group around 1/2 to 1 MOA at 100 yards with the 16 inch barrel. Which is good for a tactical type rifle. It likely would shoot the 60s grain bullets a little more accurate ??? but I am satisfied with the performance of the 55s. I had previously posted a thread on barrel twist compared to bullet weight if you want to research it.

Correction from previous Post! The M-16 A-1 Rifle has a 1:12 Twist Rate.

__________________

The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
*Patrick Henry

Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."